Connected: An Internet Encyclopedia
RFC 1035 - 3.3.11. NS RDATA format

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### 3.3.11. NS RDATA format

        +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
        /                   NSDNAME                     /
        /                                               /
        +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+

where:

    NSDNAME         A <domain-name> which specifies a host which should be
                    authoritative for the specified class and domain.

NS records cause both the usual additional section processing to locate a type A record, and, when used in a referral, a special search of the zone in which they reside for glue information.

The NS RR states that the named host should be expected to have a zone starting at owner name of the specified class. Note that the class may not indicate the protocol family which should be used to communicate with the host, although it is typically a strong hint. For example, hosts which are name servers for either Internet (IN) or Hesiod (HS) class information are normally queried using IN class protocols.

Next: 3.3.12. PTR RDATA format

Connected: An Internet Encyclopedia
RFC 1035 - 3.3.11. NS RDATA format